The FAST Galactic Plane Pulsar Snapshot Survey: V. PSR J1901+0658 in a double neutron star system
W. Q. Su, J. L. Han, Z. L. Yang, P. F. Wang, J. P. Yuan, C. Wang, D. J. Zhou, T. Wang, Y. Yan, W. C. Jing, N. N. Cai, L. Xie, J. Xu, H. G. Wang, R. X. Xu, X. P. You
arXiv:2403.11635v1 Announce Type: new
Abstract: Double neutron star (DNS) systems offer excellent opportunities to test gravity theories. We report the timing results of a pulsar, PSR J1901+0658, discovered in the FAST Galactic Plane Pulsar Snapshot (GPPS) survey. Based on timing observations by FAST over 5 years, we obtain the phase-coherent timing solutions and derive the precise measurements of its position, spin parameters, orbital parameters, and also the dispersion measure (DM). It has a period of 75.7 ms, a period derivative of 2.169(6)$times 10^{-19}$ s s$^{-1}$, and the characteristic age of 5.5 Gyr. This pulsar is in an orbit with a period of 14.45 days and an eccentricity of 0.366. One post-Keplerian parameter, periastron advance, has been well measured as being 0.00531(9) deg/yr, from which the total mass of this system is derived to be 2.79(7) $M_{sun}$. The pulsar has the upper limit of mass of 1.68 $M_{sun}$, so the lower limit for the companion mass is 1.11 $M_{sun}$. Because PSR J1901+0658 is a partially recycled pulsar in an eccentric binary orbit with such a large companion mass, it should be in a DNS system according to the evolution history of the binary system.arXiv:2403.11635v1 Announce Type: new
Abstract: Double neutron star (DNS) systems offer excellent opportunities to test gravity theories. We report the timing results of a pulsar, PSR J1901+0658, discovered in the FAST Galactic Plane Pulsar Snapshot (GPPS) survey. Based on timing observations by FAST over 5 years, we obtain the phase-coherent timing solutions and derive the precise measurements of its position, spin parameters, orbital parameters, and also the dispersion measure (DM). It has a period of 75.7 ms, a period derivative of 2.169(6)$times 10^{-19}$ s s$^{-1}$, and the characteristic age of 5.5 Gyr. This pulsar is in an orbit with a period of 14.45 days and an eccentricity of 0.366. One post-Keplerian parameter, periastron advance, has been well measured as being 0.00531(9) deg/yr, from which the total mass of this system is derived to be 2.79(7) $M_{sun}$. The pulsar has the upper limit of mass of 1.68 $M_{sun}$, so the lower limit for the companion mass is 1.11 $M_{sun}$. Because PSR J1901+0658 is a partially recycled pulsar in an eccentric binary orbit with such a large companion mass, it should be in a DNS system according to the evolution history of the binary system.